Sunday, October 18, 2009

This article is the first part of a three-part series, which considers the effect of global warming on ocean level rise, and examines life with constantly advancing seas from two perspectives: that of the landlubber and that of the seafarer.

[Update, November 2009: The Copenhagen Diagnosis, the heavily peer-reviewed interim update to the IPCC AR4, further validates the sea-level rise assumptions we used in this article: "By 2100, global sea-level is likely to rise at least twice as much as projected by Working Group 1 of the IPCC AR4; for unmitigated emissions it may well exceed 1 meter. The upper limit has been estimated as ~ 2 meters sea level rise by 2100. Sea level will continue to rise for centuries after global temperatures have been stabilized, and several meters of sea level rise must be expected over the next few centuries."]

Part I: The Global Mistake

In September 2009 the latest global temperature rise projections released by the Hadley Centre, part of the British Meteorological Office indicated an average rise of 4 degrees Celsius (that’s a balmy 7.2°F) by 2055 given a business as usual scenario. Some places will be a bit more stable, but the places that particularly matter – the ice caps, the methane-rich permafrosts in northern Canada and Siberia, and the Amazon rainforest – will be melting, off-gassing, and burning, respectively. The report offers some detail on what that would feel like:

In a 4°C world, climate change, deforestation and fires spreading from degraded land into pristine forest will conspire to destroy over 83 per cent of the Amazon rainforest by 2100... in a 4°C world there will be a mix of extremely wet monsoon seasons and extremely dry ones, making it hard for farmers to plan what to grow. Worse, the fine aerosol particles released into the atmosphere by burning fossil fuels could put a complete stop to the monsoon rains in central southern China and northern India... the people most vulnerable to a 4°C rise are also least able to escape it. At 4°C, the poor will struggle to survive, let alone escape.

And what of that lodestone, global sea level? This happens to be a very interesting question, because ocean levels are set to rise dramatically. According to UCLA scientists, the last time carbon dioxide levels were as high as they are today was 15 million years ago. At that time, the sea level was between 20 and 36 metres higher (75 to 120 feet), there was no permanent ice cap in the arctic, and very little ice in Antarctica or Greenland. That is where we are headed. The only remaining question is, How long will it take us to get there?

The authors of the Hadley Centre report predict a rise of just 1.4 metres by 2100. The IPCC in their 2007 4th Assessment Report predicted something like half a metre by 2100 based on a combination of the fattening of the oceanic envelope caused by thermal expansion and the increased runoff from glaciers and minor ice sheets. None of this sounds particularly catastrophic just yet, but then it turns out that these predictions are not based on anything particularly relevant: the British Antarctic Survey, in 2008, made it clear that the IPCC had not included the source of nearly 100% of the world’s potential ice melt – the major ice caps of Antarctica and Greenland – simply because they had little idea of how the ice caps would behave in a heating world:

The Intergovernmental Panel on Climate Change (IPCC) highlighted the issue by suggesting that current knowledge is inadequate to estimate confidently the contribution that ice sheets might make to sea-level rise in coming centuries. While technology makes sea-level rise easier to observe, and we can predict some contributions to future sea-level rise with increasing certainty, we cannot yet fully predict the ice sheets’ contribution. There is thus a risk that sea-level rise could be higher than the (incomplete) estimates provided by the IPCC.

Thus, the most peer-reviewed piece of climate science ever written turns out to be completely inadequate when it comes to estimating the level of disruption associated with a very important aspect of climate change: the rising seas. If Antarctica contains 90% of the world’s land ice (sea ice, like that in the Arctic, does not directly cause the oceans to rise when it melts) and Greenland contains most of the rest, then what’s going to happen when they start to melt with a vengeance, and when are they going to start melting? Official science is mute on the subject.

What Do We Know?

There are some things that we do know. Based on the volume of ice lying upon the landmass of Greenland, it is quite possible to estimate how far the oceans would rise, should all of it melt away: something in the region of 7.2 metres. That may not seem like a lot, but, as you will see in Part 2 of this series, it will be enough to have devastating consequences for the lower lying parts of the world, which, not coincidentally, are the locations of some of the world’s largest cities. (In fact, there is something you can do to make reading this article more exciting: find out how high above sea level you live, and, as you read along, keep checking to see if your head is still above water.)

Rapid, dramatic change beggars the imagination. The Greenland Ice Sheet is massive, having formed during the first cycle of the most recent major glacial period, and our instinct tells us that it should remain stable in all but the most extreme conditions. It is disconcerting to know that the onset of an ice age can take as little as two decades, implying that an equally sudden melt cannot be ruled out. It is also disconcerting to know that the conditions required for a sudden melt are pretty much guaranteed to occur, and that, in fact, the ice sheet is already melting. We don't have to imagine it. All we have to do is observe:

For the first time since measurements were started [in 2002], the extremely warm summer of 2007 saw a decrease in the ice mass at high altitudes (above 2,000 metres). It also became clear that the ice loss is advancing towards the North of Greenland, particularly on the west coast. The areas around Greenland, particularly Iceland, Spitsbergen and the northern islands of Canada, seem to be particularly badly affected.

This analysis, by the team controlling the GRACE satellite system, is essentially saying that conditions like those in 2007 are able to counteract the damping effect of even the thickest parts of Greenland’s ice sheet. So, when will all the ice melt? There are two schools of thought, but they basically come down to when the temperature of Greenland increases by either 4°C or 8°C above the mean global average of the last 100 years.Four degrees... haven’t we seen that first figure before? In fact, a global rise of 4 degrees corresponds to a considerably larger rise of Arctic temperatures: conventionally this is between 5 and 6 degrees, but if you look at the 2009 Hadley Centre forecasts, a global rise of 4 degrees actually corresponds to an 8 degree rise across much of Greenland. Pick any number you like, but Greenland is melting.

WAIS To Go?

We can take some comfort in the thought that the melting of the Greenland Ice Sheet would take at least 100 years once it reached that temperature. But it accounts for just 10% of the global ice volume, the other 90% being locked away in the seemingly impermeable heart of Antarctica. Or not: the East Antarctic ice sheet (that’s the big blob that surrounds the South Pole just off-centre) seems to be quite stable, and should remain that way for the next few centuries, but West Antarctica (the peninsula that reaches north toward South America) is not stable at all. The WAIS (West Antarctic Ice Sheet) is largely below sea level, having over several million years pushed down and scoured out the bedrock beneath it, but because of its huge area, the part of it that is above water still manages to comprise around 10% of the total Antarctic ice volume. If this were to melt then the oceans would rise by another 5 metres, in addition to the thermal expansion of 1.4 metres, plus whatever has been sloughed off the Greenland ice sheet, giving us 13.6 metres, or close to 45 feet. (Is your head still above water? Please check again now.)

Icebergs and glaciers have been calving from West Antarctica at an accelerating rate over the last decade, which groups such as the British Antarctic Survey (BAS) and the National Snow and Ice Data Center (NSIDC) have been carefully monitoring, with increasing alarm. In 2002, to most glaciologists’ horror, the entire Larsen B ice shelf disintegrated. It consisted largely of floating ice, and so despite the immense size of the shelf, this development had no effect on sea levels. But it did presage a new era of rapid ice movement, never before recorded in the modern era. It also had another, even more sinister side-effect on West Antarctica:

An ice bridge connecting the Wilkins Ice Shelf on the Antarctic Peninsula to Charcot Island has disintegrated. The event continues a series of breakups that began in March 2008 on the ice shelf, and highlights the effect that climate change is having on the region. Images from the NASA Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on the Terra and Aqua satellites showed the shattering of the ice bridge between March 31, 2009 and April 6, 2009. The loss of the ice bridge, which was bracing the remaining portions of the Wilkins ice shelf, will now allow a mass of broken ice and icebergs to drift into the Southern Ocean.

The Wilkins is following a pattern of instability and rapid collapse that many Antarctic Peninsula ice shelves have experienced in recent years. Scientists think that the dramatic loss of these ice shelves, which have existed for hundreds to thousands of years, is an important sign of climate change in the Southern Hemisphere. The loss of an ice shelf can also allow the glaciers that feed into it to start flowing ice into the ocean at an accelerated rate, contributing to a rise in global sea levels.

The last phrase is the most important one; at the moment there is no major concern about the status of most of the WAIS, and the temperature seems to be holding, but if the ice shelves are no longer able to hold back the progress of the glaciers, then they will accelerate towards the sea, themselves causing further instability within the WAIS. Going back to the Hadley Centre article again, it was thought that Greenland was invulnerable to change not so many years ago, but the map produced by the Centre shows warming of between 4 and 10 degrees by 2055. This would still keep the vast majority of Antarctica well below freezing; but ice under extreme pressure can exhibit unusual patterns of behaviour, including increasing internal temperature and self-lubrication. This is what often happens at the bases of deep glaciers, allowing them to slide even when temperatures are well below freezing. The results may continue to confound and horrify glaciologists for years to come while sending the rest of us scampering for higher ground.

A Storm Surge of Forecasts

2001 was the first year we were able to say with any scientific certainty what was likely to happen to global sea level. It seems strange that it should take so long to provide forecasts, but until a consensus on global temperature rise had been achieved, via the IPCC’s Third Assessment Report (TAR), then the (supposedly) largest element of the sea level rise equation – the aforementioned thermal expansion – could not be included.

So what did the IPCC say back in 2001? If you read their report, you will discover that of the absolute maximum 0.5 metre rise by 2090, predicted by this august group of scientists, a whopping 74% was due to thermal expansion, with 11cm (22%) dependent on glacier and ice cap melting (mountaintops, essentially), and a miserly 2cm attributable to the possible melting of the Greenland and Antarctic ice sheets. But then in this report the absolute worst case “business as usual” model shows a 2°C rise by 2050, which we now know to have been a bit shy of the mark.

Then, in 2007, the landmark 4th Assessment Report raised the bar in both possible temperature rise (from 5.6°C to 6.4°C by 2100) and global sea level rise, to... wait for it... 0.57 metres! Of this new figure, which hardly seems to reflect the immense strides made in feedback loop analysis in the intervening six years, 38 cm or 67% of the rise is attributable to thermal expansion. With this in mind, it would pay to reflect on the types of changes described in this essay, and consider what the IPCC would have predicted had ice sheet melt been included in the final version.

Forward to 2009, and two papers jump out. The first, from the relatively conservative Dr Mark Siddall at the University of Bristol is now talking about a possible rise of 0.82 metres by the end of this century, which is based on the IPCC 4AR maximum temperature of 6.4°C. The second paper, by Grinsted, Moore and Jevrejeva, again based on the IPCC maximum, suggests that a 1.3 metre rise by 2100 is not out of the question. How much of this can be attributed to Greenland and Antarctica is uncertain, but predicting the future based on thermal expansion plus a paleological record of a few thousand years, during which both ice sheets remained fully intact and temperatures never rose above 1.5°C seems a pretty poor basis upon which to predict future tipping points!

If we are to take the two papers at face value and strike a mean of 1.06 metres, by overlaying the latest predictions of temperature rise – which are double the IPCC predictions – we get at least 2 metres globally. That’s just thermal expansion plus a few hundred glaciers and mountaintop ice caps. Now consider what happens when you include the following:

Tipping point effects above 8°C in Greenland

Unknown effects of similar temperature increases on the West Antarctic Ice Sheet

Increases in storm surge height and storm intensity caused by a rise in oceanic and atmospheric energy levels due to temperature rise

Increases in inland flooding due to convectional storms upon hardpan (parched clay soils) and more energetic rainstorms from temperature increases

The last two are the inevitable effects of increasing atmospheric energy due to higher temperatures, and are critical because most coastal flooding is the result of either coastal storm surges and high winds, inland flooding inundating river catchments, or a combination of the two. The flooding of eastern England and the Netherlands in 1953, which resulted in the deaths of around 2,500 people, was a combination of a low pressure storm surge, an intense North Sea storm and a high spring tide. Without any inference of global sea level rise, the water rose along the North Sea coast by 4.5 metres.

Via Denmark and the German curve, the storm got closer to the Dutch coast. On the night of the 31st of January, the storm over the North Sea got even stronger, reaching gales of force 11. The Dutch coast was being hit with force 10 winds. The storm continued, and in the south-western Netherlands, wind speeds of force 9 were measured for 20 consecutive hours. The power of the storm drove the water so high that the water was unable to retreat away sufficiently. There was no ebb tide.

Shortly after midnight, the maximum whip up of the water was measured - the wind drove the water up to 3.1 metres. Three hours later, there was a spring tide. Through the combination of this spring tide, and the huge whipping up of the water, at 3hr24, the highest recorded water level was reached - 4.55 metres above NAP (Normal Amsterdam Water Level).

The dikes were not designed to hold such high water levels, and [at] around 3 o’clock that night, the first dikes broke through...

* * *

And so there we have it. A few degrees warmer, a few metres higher, and a couple of decades later, and there we will be, floating about, holding on to other things that float, perching in tree limbs and on rooftops, and hoping to be rescued. We know where we are going to end up eventually: at least 20 metres (65 feet) higher. The one thing we still do not know is how long it will take for us to get there.

We could keep waiting for the scientific community to settle on a consensus forecast, but this may take so long that it will have to be delivered through a snorkel. However, we can already observe that the doubling period of scientific climate forecasts is uncomfortably short, and, to provide for a margin of safety, we should at least double the latest estimates. If the latest forecast is for 2 metres this century, let us assume that we will see at least 4, and plan accordingly.

But do the exact forecasts even matter? We already know enough to say that there is a high probability that ocean levels will rise, significantly, within the lifetimes of most of the people alive today, disrupting the patterns of daily life for much of the world's population, which tends to be clustered along the coastlines and the navigable waterways. We also know that ocean levels will continue to rise far into the future, until they are 20 to 36 metres higher than they are today. We know that continuous coastal erosion and salt water inundation, coastal flooding and displacement of coastal populations, which number in the billions, toward higher ground, will be normal and expected. We also know that there is a high chance these changes will occur based on present carbon dioxide levels, regardless of what is being currently proposed by the governments of the world to reduce greenhouse gas emissions.

However, what we do not know is perhaps most important of all if you are in the middle of all this. We have not considered what ways of inhabiting the changing coastal landscape will remain viable. How will we have to adapt if any of us are to avoid being swept up in a continuous, endless surge of refugees feeling for higher ground, abandoning all they own and all they know? These are the questions that the next two parts of this series of articles will examine.Keith Farnish is author of "Time's Up! An Uncivilized Solution To A Global Crisis" (http://www.timesupbook.com) and also writes The Earth Blog and The Unsuitablog. He enjoys being a husband and dad, walking around and growing things.

Friday, October 16, 2009

There is an awful lot of rather fruitless discussion of finance going on these days. People hold public disputations on whether we have inflation (and you'd think we do if you've been forced to pay for your own food lately!) or deflation (certainly a fact if you've been trying to unload real estate!), or perhaps both of these at the same time? One thing is certain: a faint odour of one sort or another pervades the US financial system, and, as usual, we in the US are the last to know. Perhaps we need to coin a new term: indiflation, anyone, to go with your indigestion? Or would you prefer dysflation, to go with your dyspepsia? Alas, currency collapse and devaluation are simply not part of the lexicon. The experience will be a rude awakening for many people, and perhaps something as rude as this requires a euphemism. I propose we refer to it as "smelling the melons." And so, in the interest of making the discussion more fruitful (pun intended) and of offering new and exciting ways of thinking about things that are smelly, ugly and worthless, and doubtlessly for your sheer reading pleasure as well, I have gratuitously cut, pasted and global-replaced a favourite passage from the classic by Jerome K. Jerome, Three Men in a Boat [Chapter IV].

I remember a friend of mine, buying a couple of suitcases of US Dollars at Liverpool. Splendid US Dollars they were, ripe and mellow, and with a two hundred horse-power scent about them that might have been warranted to carry three miles, and knock a man over at two hundred yards. I was in Liverpool at the time, and my friend said that if I didn’t mind he would get me to take them back with me to London, as he should not be coming up for a day or two himself, and he did not think the US Dollars ought to be kept much longer.

“Oh, with pleasure, dear boy,” I replied, “with pleasure.”

I called for the US Dollars, and took them away in a cab. It was a ramshackle affair, dragged along by a knock-kneed, broken-winded somnambulist, which his owner, in a moment of enthusiasm, during conversation, referred to as a horse. I put the US Dollars on the top, and we started off at a shamble that would have done credit to the swiftest steam-roller ever built, and all went merry as a funeral bell, until we turned the corner. There, the wind carried a whiff from the US Dollars full on to our steed. It woke him up, and, with a snort of terror, he dashed off at three miles an hour. The wind still blew in his direction, and before we reached the end of the street he was laying himself out at the rate of nearly four miles an hour, leaving the cripples and stout old ladies simply nowhere.

It took two porters as well as the driver to hold him in at the station; and I do not think they would have done it, even then, had not one of the men had the presence of mind to put a handkerchief over his nose, and to light a bit of brown paper.

I took my ticket, and marched proudly up the platform, with my US Dollars, the people falling back respectfully on either side. The train was crowded, and I had to get into a carriage where there were already seven other people. One crusty old gentleman objected, but I got in, notwithstanding; and, putting my US Dollars upon the rack, squeezed down with a pleasant smile, and said it was a warm day.

A few moments passed, and then the old gentleman began to fidget.

“Very close in here,” he said.

“Quite oppressive,” said the man next him.

And then they both began sniffing, and, at the third sniff, they caught it right on the chest, and rose up without another word and went out. And then a stout lady got up, and said it was disgraceful that a respectable married woman should be harried about in this way, and gathered up a bag and eight parcels and went. The remaining four passengers sat on for a while, until a solemn-looking man in the corner, who, from his dress and general appearance, seemed to belong to the undertaker class, said it put him in mind of dead baby; and the other three passengers tried to get out of the door at the same time, and hurt themselves.

I smiled at the black gentleman, and said I thought we were going to have the carriage to ourselves; and he laughed pleasantly, and said that some people made such a fuss over a little thing. But even he grew strangely depressed after we had started, and so, when we reached Crewe, I asked him to come and have a drink. He accepted, and we forced our way into the buffet, where we yelled, and stamped, and waved our umbrellas for a quarter of an hour; and then a young lady came, and asked us if we wanted anything.

“What’s yours?” I said, turning to my friend.

“I’ll have half-a-crown’s worth of brandy, neat, if you please, miss,” he responded.

And he went off quietly after he had drunk it and got into another carriage, which I thought mean.

From Crewe I had the compartment to myself, though the train was crowded. As we drew up at the different stations, the people, seeing my empty carriage, would rush for it. “Here y’ are, Maria; come along, plenty of room.” “All right, Tom; we’ll get in here,” they would shout. And they would run along, carrying heavy bags, and fight round the door to get in first. And one would open the door and mount the steps, and stagger back into the arms of the man behind him; and they would all come and have a sniff, and then droop off and squeeze into other carriages, or pay the difference and go first [class].

From Euston [Station], I took the US Dollars down to my friend’s house. When his wife came into the room she smelt round for an instant. Then she said:

“What is it? Tell me the worst.”

I said:

“It’s US Dollars. Tom bought them in Liverpool, and asked me to bring them up with me.”

And I added that I hoped she understood that it had nothing to do with me; and she said that she was sure of that, but that she would speak to Tom about it when he came back.

My friend was detained in Liverpool longer than he expected; and, three days later, as he hadn’t returned home, his wife called on me.

She said:

“What did Tom say about those US Dollars?”

I replied that he had directed they were to be kept in a moist place, and that nobody was to touch them.

She said:

“Nobody’s likely to touch them. Had he smelt them?”

I thought he had, and added that he seemed greatly attached to them.

“You think he would be upset,” she queried, “if I gave a man a sovereign to take them away and bury them?”

I answered that I thought he would never smile again.

An idea struck her. She said:

“Do you mind keeping them for him? Let me send them round to you.”

“Madam,” I replied, “for myself I like the smell of US Dollars, and the journey the other day with them from Liverpool I shall ever look back upon as a happy ending to a pleasant holiday. But, in this world, we must consider others. The lady under whose roof I have the honour of residing is a widow, and, for all I know, possibly an orphan too. She has a strong, I may say an eloquent, objection to being what she terms 'put upon.' The presence of your husband’s US Dollars in her house she would, I instinctively feel, regard as a 'put upon'; and it shall never be said that I put upon the widow and the orphan.”

“Very well, then,” said my friend’s wife, rising, “all I have to say is, that I shall take the children and go to an hotel until those US Dollars are destroyed. I decline to live any longer in the same house with them.”

She kept her word, leaving the place in charge of the charwoman, who, when asked if she could stand the smell, replied, “What smell?” and who, when taken close to the US Dollars and told to sniff hard, said she could detect a faint odour of melons. It was argued from this that little injury could result to the woman from the atmosphere, and she was left.

Friday, October 09, 2009

I've said it here before: Obama is the new Gorbachev, the smiling face behind the crumbling imperial façade, the personable, non-threatening loser. Gorbachev got his Nobel Consolation Prize in October 1990; a little less than a year later the USSR was no more and he was unemployed.

In awarding him the Peace Prize, the Nobel committee actually did some good: by reaffirming his legitimacy as a leader, it helped to weaken the hand of the conservative forces within Russia, which later staged an unsuccessful coup in an effort to reclaim control of the dissolving empire.

Gorbachev certainly deserves credit for making sure that the USSR disintegrated with a whimper and not a bang. May Barak Obama be just as successful in completing the dissolution of the USA, quietly and without any undue bloodshed. Moving forward, I wish him a long and happy unemployment.

"President Gorbachev yesterday won the world's biggest consolation prize. He took the Nobel peace award for losing the Cold War, becoming the first communist leader to win the trophy worth £360,000 after dismantling the system his party spent 70 years creating.

"The Nobel prize committee in Oslo did not quite put it that way. It cited Mr Gorbachev for "his leading role in the peace process" which today characterises parts of the world....

"In Moscow, hit by shortages of basic foods and consumer goods, the mood was more reserved. When the president of the Supreme Soviet, Anatoly Lukyanov, announced the news to MPs, they applauded for barely five seconds. Gennady Gerasimov, the foreign ministry spokesman, said: "We must remember, this certainly was not the prize for economics..."

...Nor is it the prize for economics this time around! If anything, the financial hole the USSR left behind was a whole lot smaller.

Now, some people think that Obama isn't doing a good job. He isn't. That's because it's not a good job. It's not even a bad job. It's a downright terrible job. But somebody's got to do it, and that somebody just won a Nobel prize, so he must be doing something right.